Fixing winsock2.h and windows.h Redefinition Errors
If you are building a Windows application that includes both winsock2.h and windows.h, you have probably seen a wall of redefinition errors for sockaddr, fd_set or timeval.
Dev Notes
Practical notes for developers and sysadmins: build errors, browsers, Linux and Windows, plus the domain's original tech notes.
Explainers 5Archive notes 6Updated 18 September 2026
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Earlier drafts of some notes are in the early notes.